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# Copyright (c) 2015 Ericsson AB
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from unittest import mock
from nova import objects
from nova.scheduler import weights
from nova.scheduler.weights import affinity
from nova import test
from nova.tests.unit.scheduler import fakes
class SoftWeigherTestBase(test.NoDBTestCase):
def setUp(self):
super(SoftWeigherTestBase, self).setUp()
self.weight_handler = weights.HostWeightHandler()
self.weighers = []
def _get_weighed_host(self, hosts, policy, group='default'):
if group == 'default':
members = ['member1', 'member2', 'member3', 'member4', 'member5',
'member6', 'member7']
else:
members = ['othermember1', 'othermember2']
request_spec = objects.RequestSpec(
instance_group=objects.InstanceGroup(
policy=policy,
members=members))
return self.weight_handler.get_weighed_objects(self.weighers,
hosts,
request_spec)[0]
def _get_all_hosts(self):
host_values = [
('host1', 'node1', {'instances': {
'member1': mock.sentinel,
'instance13': mock.sentinel
}}),
('host2', 'node2', {'instances': {
'member2': mock.sentinel,
'member3': mock.sentinel,
'member4': mock.sentinel,
'member5': mock.sentinel,
'othermember1': mock.sentinel,
'othermember2': mock.sentinel,
'instance14': mock.sentinel
}}),
('host3', 'node3', {'instances': {
'instance15': mock.sentinel
}}),
('host4', 'node4', {'instances': {
'member6': mock.sentinel,
'member7': mock.sentinel,
'instance16': mock.sentinel
}})]
return [fakes.FakeHostState(host, node, values)
for host, node, values in host_values]
def _do_test(self, policy, expected_weight, expected_host,
group='default'):
hostinfo_list = self._get_all_hosts()
weighed_host = self._get_weighed_host(hostinfo_list,
policy, group)
self.assertEqual(expected_weight, weighed_host.weight)
if expected_host:
self.assertEqual(expected_host, weighed_host.obj.host)
class SoftAffinityWeigherTestCase(SoftWeigherTestBase):
def setUp(self):
super(SoftAffinityWeigherTestCase, self).setUp()
self.weighers = [affinity.ServerGroupSoftAffinityWeigher()]
self.softaffin_weigher = affinity.ServerGroupSoftAffinityWeigher()
def test_soft_affinity_weight_multiplier_by_default(self):
self._do_test(policy='soft-affinity',
expected_weight=1.0,
expected_host='host2')
def test_soft_affinity_weight_multiplier_zero_value(self):
# We do not know the host, all have same weight.
self.flags(soft_affinity_weight_multiplier=0.0,
group='filter_scheduler')
self._do_test(policy='soft-affinity',
expected_weight=0.0,
expected_host=None)
def test_soft_affinity_weight_multiplier_positive_value(self):
self.flags(soft_affinity_weight_multiplier=2.0,
group='filter_scheduler')
self._do_test(policy='soft-affinity',
expected_weight=2.0,
expected_host='host2')
def test_soft_affinity_weight_multiplier(self):
self.flags(soft_affinity_weight_multiplier=0.0,
group='filter_scheduler')
host_attr = {'instances': {'instance1': mock.sentinel}}
host1 = fakes.FakeHostState('fake-host', 'node', host_attr)
# By default, return the weight_multiplier configuration directly
self.assertEqual(0.0, self.softaffin_weigher.weight_multiplier(host1))
host1.aggregates = [
objects.Aggregate(
id=1,
name='foo',
hosts=['fake-host'],
metadata={'soft_affinity_weight_multiplier': '2'},
)]
# read the weight multiplier from metadata to override the config
self.assertEqual(2.0, self.softaffin_weigher.weight_multiplier(host1))
host1.aggregates = [
objects.Aggregate(
id=1,
name='foo',
hosts=['fake-host'],
metadata={'soft_affinity_weight_multiplier': '2'},
),
objects.Aggregate(
id=2,
name='foo',
hosts=['fake-host'],
metadata={'soft_affinity_weight_multiplier': '1.5'},
)]
# If the host is in multiple aggs and there are conflict weight values
# in the metadata, we will use the min value among them
self.assertEqual(1.5, self.softaffin_weigher.weight_multiplier(host1))
def test_host_with_agg(self):
self.flags(soft_affinity_weight_multiplier=0.0,
group='filter_scheduler')
hostinfo_list = self._get_all_hosts()
aggs = [
objects.Aggregate(
id=1,
name='foo',
hosts=['fake-host'],
metadata={'soft_affinity_weight_multiplier': '1.5'},
)]
for h in hostinfo_list:
h.aggregates = aggs
weighed_host = self._get_weighed_host(hostinfo_list,
'soft-affinity')
self.assertEqual(1.5, weighed_host.weight)
self.assertEqual('host2', weighed_host.obj.host)
def test_running_twice(self):
"""Run the weighing twice for different groups each run
The first run has a group with more members on the same host than the
second both. In both cases, most members of their groups are on the
same host => weight should be maximum (1 with default multiplier).
"""
self._do_test(policy='soft-affinity',
expected_weight=1.0,
expected_host='host2')
self._do_test(policy='soft-affinity',
expected_weight=1.0,
expected_host='host2',
group='other')
class SoftAntiAffinityWeigherTestCase(SoftWeigherTestBase):
def setUp(self):
super(SoftAntiAffinityWeigherTestCase, self).setUp()
self.weighers = [affinity.ServerGroupSoftAntiAffinityWeigher()]
self.antiaffin_weigher = affinity.ServerGroupSoftAntiAffinityWeigher()
def test_soft_anti_affinity_weight_multiplier_by_default(self):
self._do_test(policy='soft-anti-affinity',
expected_weight=1.0,
expected_host='host3')
def test_soft_anti_affinity_weight_multiplier_zero_value(self):
# We do not know the host, all have same weight.
self.flags(soft_anti_affinity_weight_multiplier=0.0,
group='filter_scheduler')
self._do_test(policy='soft-anti-affinity',
expected_weight=0.0,
expected_host=None)
def test_soft_anti_affinity_weight_multiplier_positive_value(self):
self.flags(soft_anti_affinity_weight_multiplier=2.0,
group='filter_scheduler')
self._do_test(policy='soft-anti-affinity',
expected_weight=2.0,
expected_host='host3')
def test_soft_anti_affinity_weight_multiplier(self):
self.flags(soft_anti_affinity_weight_multiplier=0.0,
group='filter_scheduler')
host_attr = {'instances': {'instance1': mock.sentinel}}
host1 = fakes.FakeHostState('fake-host', 'node', host_attr)
# By default, return the weight_multiplier configuration directly
self.assertEqual(0.0, self.antiaffin_weigher.weight_multiplier(host1))
host1.aggregates = [
objects.Aggregate(
id=1,
name='foo',
hosts=['fake-host'],
metadata={'soft_anti_affinity_weight_multiplier': '2'},
)]
# read the weight multiplier from metadata to override the config
self.assertEqual(2.0, self.antiaffin_weigher.weight_multiplier(host1))
host1.aggregates = [
objects.Aggregate(
id=1,
name='foo',
hosts=['fake-host'],
metadata={'soft_anti_affinity_weight_multiplier': '2'},
),
objects.Aggregate(
id=2,
name='foo',
hosts=['fake-host'],
metadata={'soft_anti_affinity_weight_multiplier': '1.5'},
)]
# If the host is in multiple aggs and there are conflict weight values
# in the metadata, we will use the min value among them
self.assertEqual(1.5, self.antiaffin_weigher.weight_multiplier(host1))
def test_host_with_agg(self):
self.flags(soft_anti_affinity_weight_multiplier=0.0,
group='filter_scheduler')
hostinfo_list = self._get_all_hosts()
aggs = [
objects.Aggregate(
id=1,
name='foo',
hosts=['host1', 'host2', 'host3', 'host4'],
metadata={'soft_anti_affinity_weight_multiplier': '1.5'},
)]
for h in hostinfo_list:
h.aggregates = aggs
weighed_host = self._get_weighed_host(hostinfo_list,
'soft-anti-affinity')
self.assertEqual(1.5, weighed_host.weight)
self.assertEqual('host3', weighed_host.obj.host)
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